Method and device for joining two opposingly directed yarn ends by a weaver&#39;s knot



March 14, 1967 s. FURST 3,309,124

METHOD AND DEVICE FOR JOINING TWO OPPOSINGLY DIRECTED YARN ENDS BY AWEAVER'S KNOT Filed Jan. 18, 1965 v 3 SheetSSheet 1 ar h 14, 19 7 s.FURST 3,309,124

METHOD AND DEVICE FOR JOINING TWO OPPOSINGLY DIRECTED YARN ENDS BY AWEAVER'S KNOT Filed Jan. 18, 1965 3 Sheets-Sheet 2 March 14, 1967 sFURST 3,309,124

METHOD AND DEVICE FOR JOINING TWO OPPOSINGLY DIRECTED YARN ENDS BY AWEAVER'S KNOT Filed Jan. 18, 1965 5 Sheets$heet 5 INVENTO/P Unite StatesPatent Ofifice 3,309,124 METHOD AND DEVICE FOR JOINING TWO OPPDSINGLYDIRECTED YARN ENDS BY A WEAVERS KNOT Stefan Fur-st, Monchen-Gladbach,Germany, assignor to Walter Reiners, Monchen-Gladbach, Germany FiledJan. 18, 1965, Ser. No. 426,716 Claims priority, application Germany,Jan. 18, 1964, R 37,002 5 Claims. (Cl. 289-15) My invention relates to amethod and device for joining two opposingly directed yarn ends by aweavers knot. As a rule, yarn knotting devices, as employed in textllemachinery and known, for example, from US. Patents 2,981,559 and3,110,511 produce a fishermans knot.

There are also known devices for joining two yarn ends by a weavers knotwith the aid of a tie beak. These devices require that the two lengthsof yarn to be knotted together extend parallel beside each other whenbeing inseited into the knotter with both yarn ends pointing in the samedirection so that they can be jointly knotted at the same time. While inthis manner the knot can be produced with very simple means, the knowndevices are not applicable if two opposingly directed yarn ends are tobe joined together, as is preferable for knotting devices inyarn-package winding machines in which a lower thread coming from a yarnsupply coil is to be tied together with an upper thread coming from atake-up spool. If the two yarn ends thus pointing inopposed directionsWere to be tied together in the known manner to a weavers knot, thewrong ends would be pulled tight, the knot would fail to beself-locking, and the yarn ends would be pulled apart.

It is an object of my invention to provide a method and a device whichaffords joining two yarn ends by a weavers knot with the aid of a tiebeak despite the fact that the yarn ends point in opposed directions.

Another, related object is to render a weavers knot producing device,and thereby the advantages of its relatively simple design and smallsize, applicable in yarnpackage winding machines and for similar textilefabricating purposes where it is necessary or desirable to pass the twolengths of yarn from opposite directions into engagement with theknotter.

According to the invention, the tying method is performed by firstengaging one of the two yarn ends with the tie beak and forming thisyarn end into a loop by rotating the beak. Thereafter the second yarnend is placed into engagement with the same tie beak and knottedtogether with the first, loop-forming end.

It is by a virtue of the fact that a loop is formed in one of the twoyarn ends before commencing the knotting operation proper of the tiebeak, that the known simple method for joining yarn by a weavers knot,as Well as a correspondingly simple knotter device, become applicablealso in cases where the two yarn ends point in opposite directionsrespectively.

The method according to the invention is performed in a particularsimple manner by turning the tie beak first 180 about its axis beforeeither yarn end is placed into engagement with the beak, then engagingone yarn end with the beak and turning the beak back into the startingposition so that it forms a loop in the one yarn end only. Thereafterthe second yarn end is placed into engagement with the beak, which isthen rotated again in the forward direction to form a weavers knotjoining the looped yarn end with the second yarn end in the manner knownas such.

The method according to the invention is preferably performed with theaid of a device in which the movement of members for guiding therespective yarn ends into the operating range of the tie beak is coupledwith the move- 3,13%,124 Patented Mar. 14, 1967 ment of the tie beak insuch a manner that at the beginning of the tie-beak rotation only oneyarn end and, after a given rotation of the beak, the other yarn end issupplied to the tie beak.

According to another, more specific feature, the tie beak has a coaxialshaft controlled from a cam mechanism which also controls the movementof the yarn-guiding members.

According to still another, prefered feature the tie-beak shaft isformed as a helix or worm engaged by a driving member of the cammechanism which also controls the yarn-driving members so that a singlemovement of the cam mechanism in the given direction causes therespectively different rotational movements of the tie beak whilesimultaneously controlling the correlated movements of the yarn-guidingmembers.

The above-mentioned and other objects, advantages and features of myinvention, said features being set forth with particularity in theclaims annexed hereto, will be apparent from and will be mentioned in,the following with reference to an embodiment of a weavers-knot tyingdevice according to the invention illustrated by way of example on theaccompanying drawings in which:

FIGS. 1 through 11 are explanatory diagrams relating to different stepsof the method according to the invention resulting in the formation of aweavers knot for joining two opposingly directed yarn ends.

FIG. 12 shows, partly in section, in accordance with FIGS. 1 to 11.

Shown in FIG. 1 is a tie beak 1 of rest. A length of yarn F to be tiedtogether with another yarn end, is located in front of the tie beak.

In the stage shown in FIG. 2, the yarn F is moved into engagement withthe tie beak 1. In the meantime the beak has performed a rotation aboutits axis. In FIG. 3, the beak has rotated so that its two jaws 1a and1b, which in FIG. 1 point toward the viewer, are now pointed in theopposite direction.

Now with the tie beak at rest, the yarn is moved back to the position ofFIG. 1, so that the yarn F now occupies the slanting position shown inFIG. 4. Thereafter the tie beak is rotated in the reverse direction backto the position of FIG. 1. As a result the annular loop illustrated inFIG. 5 is formed in the yarn F When this stage is reached, the secondyarn end F coming from the opposite direction with respect to that ofyarn end F is moved into engagement with the tie beak 1 so that itoccupies the position shown in FIG. 6.

The tie beak is then again rotated in the forward direction. FIG. 7shows the tie beak after a rotation of 90. It will be seen that now theformation of a knot, joining the two yarn ends, commences. In FIG. 8,the tie beak has further rotated up to 270. It will be seen that the twojaws 1a and 1b have opened in order to seize the free portion of yarnend F and to cut it off during further 90 rotation of the beak. Thisfurther rotation of 90, resulting in a total rotation of the beakthrough 360 is shown in FIG. 9, although, for the purpose ofillustration, from a different viewing direction. FIGS. 10 and 11 showthe same stage of the tie beak as FIG. 9, but from respectivelydifferent viewing directions in order to permit representing how theprepared knot is being stripped off the tie beak. During thispreparation, the free portion of yarn end F is cut off by shears orsimilar cutters in known manner, this being schematically indicated inFIG. 10. In FIG. 11 the fully prepared weavers knot is almost entirelyremoved from the tie beak. It is then only necessary to pull the yarnends apart from each other for tightening the knot.

In the illustration of the device according to FIG. 12, the tie beak 1and the yarn ends F and F correspond to the beak and yarn ends denotedin FIGS. 1 to 11 by a knotter operating in its normal position the samerespective reference characters. The yarn ends F and F are inserted intorespective guiding notches or two lateral Wall plates 2 of which onlythe one located in the rear is visible, the front plate being omitted toprevent obscuring of other components. The device further comprises twoyarn guiding members 3 and 4 which are rotatable about a pivot pin 5 andare pressed by springs 6 and 6a against the cam contours of respectivecam discs 7 and 8. The two cams 7 and 8 are rigidly connected with eachother and are rotatable about a shaft 9 mounted on the side plates 2. Aspring 10 biases the two cams 7 and 8 against a control cam 13 mountedon a shaft 11 and rotating counterclockwise, as indicated by an arrow12, when the knotter is in operation. Firmly joined with the cams 7 and8 is a slitted bar 14 whose slit engages a helix 15 formed of twistedfiat bar material. The helix 15 serves as the shaft of the tie beak 1and consequently extends in coaxial relation to the tie beak.

As will be seen from FIG. 12, the helix 15 is given such a shape thatwhen the slotted bar 14 turns about pivot 9 toward the right, the tiebeak 1 will first perform a rotational motion about approximately 180 inone direction, then a rotation of 180 in the reverse direction, andthereafter a rotation of 360 in the first-mentioned direction. When theslitted bar 14 has almost reached the righthand end of the helix 15, itabuts against a shoulder 16 of an ejector lever 18 rotatable about apivot pin 17. The bar 14 then turns the ejector lever 18counterclockwise about pin 17 until the lever reaches the position shownby dot-and-dash lines, the corresponding ultimate positions of the bar14 and the cams 7 and 8 being also shown in this manner.

The operation of the device is as follows. When a knotting operation isto be performed, the cam 13 on shaft 11 is driven to perform a singleforward rotation according to arrow 12. The cams 7 and 8 on pivot shaft9 now rotate clockwise. The slitted bar 14 acts on the helix 15 andimparts the above-described rotational motion to the tie beak 1. At thesame time, the cams 7 and 8 separately control the guiding members 3 and4 to supply the yarn ends F and F to the tie beak 1 in the desiredsequence, also as described above. It will be recognized that duringrotational motion of the cams 7 and 8, the yarn guiding member 3 firstruns onto a lobe of cam 8 which rotates the guide member 3counterclockwise about its pivot 5. The guide member 3 then engages theyarn F and moves it toward the tie beak 1. After the tie beak 1 hasformed a loop in yarn F in accordance with FIGS. 1 to 5, the guidemember 4 runs onto a lobe of earn 7 so that now the member 4 seizes theyarn F and moves it into engagement with the tie beak 1. In themeantime, the tie beak 1 has first rotated 180 in one direction andthereafter 180 in the opposite direction so that it now can perform theknotting movement in accordance with the helix 15, namely a rotation of360 in the first-mentioned direction. Shortly before the tie beakreaches the end position, the slitted bar 14 actuates the ejector 18which pulls the prepared knot off to a tie beak 1.

It should be understood, that with the exception of first forming a loopin one yarn end prior to commencing the knotting operation proper, thisknotting operation as such is performed in the manner known as such. Thesupply of the yarn ends to the knotter or the clamping of the yarn endsin the proper position, may also be achieved in the manner known fromother knotting devices, for example by having the yarn ends frictionallyclamped between the side plates 2 of the knotter and the respective yarnguiding members 3 and 4. With respect to further details, known as suchand not essential to the present invention proper, including themounting of the described knotter in a yarn-package winding machine,reference may be had, for example, to the above-mentioned patents or tothe copending applications of Raasch et al., Ser. No. 307,077, filedSept. 6, 1963, now US. Patent 3,220,758 and Wilms et al., Ser. No.371,697, filed June 1, 1964 of common ownership.

To those skilled in the art it will be obvious, upon a study of thisdisclosure, that my invention permits of various modifications and hencemay be given embodiments other than particularly illustrated anddescribed herein, without departing from the essential features of myinvention and within the scope of the claims annexed hereto.

I claim:

1. The method of joining two opposingly directed yarn ends by a weaversknot with the aid of a tie beak, which comprises first engaging only oneof the yarn ends with the tie beak and forming an annular loop in theyarn end, then additionally engaging the other yarn end with the tiebeak and knotting both yarn ends to a weavers knot by rotation of thebeak.

2. The method of joining two opposingly directed yarn ends by a weaversknot with the aid of a tie beak, which comprises rotating the tie beakidle about its axis in a given direction through about from a startingposition, engaging only one of the yarn ends with the tie beak androtating the tie beak in the reverse direction back to the startingposition and thereby forming a loop in said one yarn end, thereafteradditionally engaging the other yarn end with the tie beak and knottingboth yarn ends to a weavers knot by rotation of the beak in said givendirection.

3. A knotting device for joining two opposingly directed yarn ends by aweavers knot, comprising a tie beak rotatable about its axis and havinga given starting position; beak actuating means for rotating said beakin a sequence having a first stage of about 180 forward rotation fromsaid starting position and a second stage of reverse rotation back tosaid starting position and a third stage of knot-forming forwardrotation from said starting position through approximately 360; yarnguide means comprising two members engageable with the respective twoyarn ends and individually movable for shifting said yarn ends intoengagement with said tie beak, and sequence control means in connectionwith said beak actuating means and said guide members for sequentiallymoving said two members to engage one yarn end with said tie beakbetween said first and second stages of beak rotation for causing saidbeak to form a loop in the first yarn end and to additionally engage thesecond yarn end with said beak between said second and third stages forcausing said beak to tie the weavers knots.

4. In a knotting device according to claim 3, said sequence controlmeans comprising a cam mechanism having cam means engaged by said guidemembers for controlling the latter, and drive means connecting said cammeans with said beak actuating means.

5. In a knotting device according to claim 4, said beak actuating meanscomprising a helical member coaxially joined with the tie beak to form ashaft therefor, said drive means being in engagement with said helicalmember for rotating it when said drive member moves axially of saidhelical member.

References Cited by the Examiner UNITED STATES PATENTS 2,125,423 8/1938Bromley et al. 289-3 2,678,229 5/1954 Shortland 289-3 3,017,211 1/1962Trost 289-3 MERVIN STEIN, Primary Examiner.

L. K. RIMRODT, Assistant Examiner,

1. THE METHOD OF JOINING TWO OPPOSINGLY DIRECTED YARN ENDS BY AWEAVER''S KNOT WITH THE AID OF A TIE BEAK, WHICH COMPRISES FIRSTENGAGING ONLY ONE OF THE YARN ENDS WITH THE TIE BEAK AND FORMING ANANNULAR LOOP IN THE YARN END, THEN ADDITIONALLY ENGAGING THE OTHER YARNEND WITH THE TIE BEAK AND KNOTTING BOTH YARN ENDS TO A WEAVER''S KNOT BYROTATION OF THE BEAK.